Lubricating device for internal-combustion engines



May 1, 1928.v` l 1,667,983

F. PORSCHE LUBRICATING DEVICE POR INTERNAL COIBUSTION ENGINES the cylinder ders of an engine.

blower casing within which ,Patented May 1, 1928.

UNITED STATES V1,667,983 PATENT OFFICE.

nnDiNAND nonsens, or nEsNE ASSIGNMENTS, GERMANY.

LUBBICATIN G STUTTGART-UNTERTUBKHEIM, GERMANY, ASSIGNOR, BY TO DAIMLER-BENZ AKTIENGESELLSCHAFT, 0F BERLIN,

DEVICE FOR INTEBNAL-COMBUSTION ENGINES.

Application filed-January 14, 1925,v Serial No. 2,454, and in Germany-August 20, 1924.

This invention relates to an apparatus for lubricating the bearings of a blower used in connection with internal combustion engines in which the charge of fuel is injected into of the engine under pressure.

Blowers of this. character commonly known as Root rotary blowers are employed to provide a temporary charge of ue under pressure to the working cylin- By'means of the operation of the blower, air is forced into the carburetor, where the air mixes with the raw fuel and thereafter enters the engine cylinders. Root rotary blowers comprise a a pair of wings are disposed, the said wings being preferably supported on ball bearings or any other type of bearing suitable for the pur pose. Bearings of this character require liberal lubrication and it has been the pracrelilled from time tice to provide the bearings with grease carrying boxes or cups at suitable places in the bearing. Such grease receptacles require attention, that is to say, they must be to time. If from neglect the bearings are allowed to run dry, serious damage to the moving parts may be Vthe result and as a consequence, interruption of the plant.

TWith the foregoing in mind it is the urpose of the present invention to coup e a lubricating system for a blower with the circulating lubricant flowing to the bearings and other moving1 parts of an internal combustion engine, t ereby entirely eliminating the necessity for grease eupsand the like and consequent attention thereto. I accomplish this purpose by means of the apparatus illustratively exemplified in the accompanying drawings, in which the figure represents a substantially longitudinal sectional view of an internal combustion engine equipped with Roots blower and oiling system.

Referrin to the drawings, a denotes an oil pump isposed in the lower part of the engine crank Case 10 and arranged to pump oil from an oil collector b disposed in a Iwall kin the crank case 10. The pump operatea to lift the oil through a stand ppe o overhead cam sha 11 receiving its rotary movement through a gear connection with the main crank shaft 12 of the engine. The cam shaft 11 rotates in suitable bearings which are lubricated by means of the oil being distributed through radial openings 13 in communication wit-hthe bearing surfaces of both the shaft and bearings. Additional distributing openings in the hollow cam shaft enable the oil not otherwise consumed in the bearings f to escape and collect in a casing It disposed between the cam shaft and head of the engine cylinders 14. It follows that oil in the casing h will eifect lubrication of the rotating crank pins of the oscillating levers and of the valve stems (not shown). YThe oil collected in the casing h is led off at one end thereof through a pipe c' which communicates with a pipe g having direct coinmunication with the interior of the crank casing b and a branch pipe y1 which directs the oil to the upper bearings k of the blower an. 'lhe blower comprises a casing L15 in which are mounted two lupright rotary wings or wheels 16, the opposite ends of the wheels beingprovided with stud shafts 17 arranged in the upper bearings 7c and lower bearings Z. The oil not consumed in the upper bearings 7c is collected beneath the latter in a recess in the casing 15 and conducted off through a passage s in the walls of the casing. The lower end sage s leads to the lower bearings Z and from the latter the oil drips upon a pair of spur gears 18 carried by the lower stud shafts 17 of the wheels 16. Beneath the gears 18 and in advance of the crank cas-- of the pasing b the oil collects in a reservoir fn, which y carries the oil at sufficient depth to immerse the lower portion of a bevel gear p carried by the main crank shaft 1:2 and imparting rotary movement to a second bevel gear p disposed on one of the lower stud shafts 17 of the blower. The necessary height of oil is maintained in the reservoir n, by a wall o projecting upright from the crank case I) adjacent the forward end. thereof. The final movement of the oil from the reservoir is to How over the wall o and thence back to the wall of the crank case b over a slightly inclined portion of the casing leading from the -forward end of the engine to the oil wall in which the oil collector is dislposed.

' n connection with the lubrication of the main crank shaft 12 of the engine and its bearings, it will suiiice to say that separate lines from the any of the we for the purpose.

I claim:

l. In an internal combustion engine th combination of a blower charging said engine under pressure, an oil container, a pipe system means to force oil from said container through said pipe system, means con- ]pump a distribute the oil in known methods employed nected with said pipe system for lubricating parts of said blower and an intermediate container arranged between said blower and said first container andA connected to said first container by overflow in order to retain the oil in said intermediate container at level suiiicient to lubricate parts of said blower by immersion.

2. In an internal combustion engine the i combination ofa blower for charging the engine under pressure, an oil container, a

pipe system, means to circulate oil from said container through said system, means to conneet said pipe system with parts of said engine to lubricate said parts and means to connect said pipe system with parts of said said oil container and connected blower to lubricate said parts, said blower havin a container to lubricate some of its parts y immersion and an intermediate container arranged betweensaid blower and awith said pipe system.

3. In an internal combustion engine the combination of a blower adapted to charge said engine under pressure an 011 container,

3 5. a pipe system, means to force oil from said container, through said system, connecting means between said pipe system and said engine to lubricate parts thereof a casing formed round the cam shaft of said engine 40 and adapted to act as a collector for oil u veying oil from said casing to said blower draining from said lubricated parts, a pipe conveying oil from said casing to said blower and means to convey oil from said blower' and an intermediate container between said blower and said container and overflow means in said intermediate container to allow oil to return to said first container after reaching a predetermined level.

5. In an internal combustion engine having a crank shaft and a earn shaft the combination ofy a Roots blower adapted to charge said engine under pressure, a geared connection between the crank shaft of said engine and said blower, an oil container, a pipe system, means to force oil from said container through said pipe system connecting means between said pipe system and said engine to lubricate parts thereof, a casing formed round the cam shaft of said engine and adapted to act as collector for oil draining from said lubricated parts, a pipe conveying oil from said casing to said blower, an intermediate container formed around said gears, and overflow means in said container connecting the latter with said first containcr arranged at a height to allow oil to accumulate to lubricate said gears.

6. In anr internal combustion engine the combination of a blower adapted to charge said engine under pressure an oil container, a pipe system, means to force oil from said container through said system, connecting means between said pipe system aiid said engine to lubricate parts4 thereof a casing formed round the cam shaft of said engine and adapted to act as collector for oil draining from said lubricated parts, a pipe oonveying oil from said casing to said blower and an intermediate container between' said blower and said container and overflow means in said intermediate container to allow oil to return to said first container after reaching a redetermined level, a tube protectin in to t e pipe connecting the casing forme round the cam shaft with the blower said tube for reconducting the excess of the lubricant directly in to the container.

7. In an internal combustion engine the combination of a blower for charging the engine under pressure, an oil reservoir, a continuous oil circulation system for said 'engine including said reservoir, positionedin operativerelation to the engine parts to be lubricated, a pump in said system and a branch circulation system including the parts of said blower which are to be lubricated, connected in parallel with said 'engine 'circulation system.

In testimon whereof I aix my signature.

'YERDINAN D PORS HE. 

